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<span id="Sorting-poly_005fints-1"></span><h4 class="subsection">10.3.7 Sorting <code>poly_int</code>s</h4>

<p><code>poly_int</code> provides the following routine for sorting:
</p>
<dl compact="compact">
<dt>&lsquo;<samp>compare_sizes_for_sort (<var>a</var>, <var>b</var>)</samp>&rsquo;</dt>
<dd><p>Compare <var>a</var> and <var>b</var> in reverse lexicographical order (that is,
compare the highest-indexed coefficients first).  This can be useful when
sorting data structures, since it has the effect of separating constant
and non-constant values.  If all values are nonnegative, the constant
values come first.
</p>
<p>Note that the values do not necessarily end up in numerical order.
For example, &lsquo;<samp>1 + 1<var>x</var></samp>&rsquo; would come after &lsquo;<samp>100</samp>&rsquo; in the sort order,
but may well be less than &lsquo;<samp>100</samp>&rsquo; at run time.
</p></dd>
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